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UNITED STATES PATENT OFFICE.

JAMES M. BOTTUM, OF' NEW YORK, N. Y.

POLISHING .APPAlM-KTUSy FOR WATCHMAKERS LATI-IES.

Specicaton of Letters Patent No. 12,502, dated March 13, 1855.

To all whom t may concern Be it known that I, J. M. Bo'r'rUM, of the city, county, and State of New York, have invented a new and useful Improvement in Polishing Apparat-us for Watchmakers, and other Lathes; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure l, is a front View of a watchmakers lathe, with my invention applied. Fig. 2, is a plan of the same. Fig. 3, is a transverse section of the polishing apparatus.

This invention relates to the application of a polishing wheel spindle to a lathe in such a manner that it is rendered capable of an universal movement to enable the wheels to adapt themselves exactly to the form of the work.

To enable those skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

A, is the mandrel head of the lathe, an B, the mandrel.

C, is the bar which carries all the other parts of the lathe.

D, is the rest block fitted and secured to the bar; and E, is the rest which carries the polishing apparatus, fitted to, and adjustable in, the rest-block.

F, is a screw fitted horizontally and transversely to the line of the center of the lathe, in front of the rest, serving both as the pivot of the swinging bracket G, and as the means of securing the said bracket in such position as may be desired. This bracket receives another screw, F which stands perpendicular to the screw, F, and serves both as a pivot for a small movable stand, G', to turn upon and as a means of securing the said stand in any desirable position.

The stand, G', contains the bearings, b, b,

for the pivot, a, of a swinging frame, H, which carries the spindle, I, of the polishing wheels. The. pivot a, stands perpendicular to the screw, F, and it is so fitted to its bearings, that it is capable of a limited longitudinal motion therein. By thus applying the spindle, it is capable of an universal movement.

The object of thus applying the polishing spindle is to allow the polishing wheel to be adjusted to polish any turned surface, either the periphery of cylindrical or conical work, or the faces of shoulders, whether square or beveled.

The periphery and face of the polishing wheel, J, will be of such shape as is suitable to the character of the work, and the wheel is adjusted to its work by unscrewing the screws, F, and F, then while it moves freely in any direction, bringing it up to the work, and tightening the two screws, F, and F.

The polishing spindle carries a pulley, c, for t-he purpose of receiving rotary motion through a band from a counter shaft receiving motion from the mandrel.

By this means the faces of shoulders of journals and pivots, and -the journals or pivots themselves, may be polished right into the corners in the best manner, with less liability to breakage, and at much less expense, than by the use of pivot files, burnishers, and metal slips, which are now used.

What AI claim as my invention and desire to secure by Letters Patent, is,

The application of the polishing spindle to the lathe in such a manner that it has an universal movement, substantially as described, for the purpose of adjusting the polishing wheel t0 surfaces of various forms.

' JAMES M. BOTTUM.

Witnesses:

Jos. G. MASON, WM. TUsoH. 

